Saw-level.



I0 MODEL.

No. 725,925; PATENTED APR. 21, 1903.[

- J. BERTRAND'.

v SAW LEVEL.

; APPLICATION FILED JUNE 9, 1902.

avwawtoz UNITED STATES JOSEPH BERTRAND, OF CHICAGO, ILLINOIS.

PATENT OFFICE.

SAW LEVEL.

BEECIFIGATION forming part of Letters Patent No. 725,925, dated April 21, 1903.

Application filed June 9, 1902. Serial No. 110,840. (No model.)

To all whom it may concern:

Be itknown thatLJOsEPH BERTRAND,acitizen of the United States, residing at Chicago, in the countyof Cook and State of Illinois,have invented certain new and useful Improvements in Saw-Levels and I do herebydeclare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to the figures of reference marked thereon, which form a part of this specification.

Thisinvention relates to saw-levels usedin determining the tension of circular saws, the I degree to which the saw is dished determining the tension thereof.

In the present state of the art straight-edge, concave, and convex levels are used and also straight-edge levels which can be adjusted to convexity.

The object of my invention is to form a level which may be adjusted to straight edge, convexity, or concavity, with a scale to indicate the adjustment.

An embodiment of the invention is hereinafter described and is illustrated in the accompanying drawings, in which- Figure 1 is an elevation of the saw-level. Fig. 2 is a cross-section on the line 2 2 of Fig. 1.

Referring specifically to the drawings, the level is formed of two side plates 6, which are spaced by and riveted to an intermediate piece 7. This intermediate piece is of less width or height than the side plates, so that a space is left between the lower edges of the plates to receive a flat flexible strip of metal, (indicated at 8.) This strip is secured at its ends to the side plates loosely by rivets 8. Between the rivets the strip works loosely between the side plates and may be sprung in or out, as indicated in dotted lines in Fig. 1, by means of the screw 9 and thumb-nut 10. Said screw is located in-a slot or opening formed in the plates and is bifurcated at its lower end to receive the upper edge of the strip 8, to which it is attached by apin 9. The thumb-nut is located in a cross-slot and when turned bears against the edges of the slot and moves the screw in the desired direction. On each side of the level the screw carries a pointer 9 which'indicates on scale 9 the extent of the adjustment. The pointers also serve to retain and guide the screw in the slot, as they bridge the slot on both sides.

As above stated, the strip 8 is fixed at its ends and may be sprung in or out or set at straight edge to form concave, convex, or straight level, respectively. The scale permits the level to be set in advance at the desired tension, so that the saw may be made to agree, or by placing the level 'on'a saw the former may be adjusted to indicate and measure the tension of the latter.

By the above construction a complete and efficient device is formed for the purpose intended.

What I claim is l. A saw-level comprising a stock-plate, a spring-strip fixed at itsends thereto, a screw fastened to the strip between said ends, and a nut on the screw bearing against the plate, to spring thestripin either direction, sub stantially as described.

2. A saw level comprising a stock plate having a scale, a spring-strip fixed at its ends thereto, a screw fastened to the strip, a nut on the screw bearing against the stock and acting to spring the strip in either direction, and a pointer carried by the screw, indicating movement of the strip on the scale, substantially as described.

In testimony whereof I affix my signature in presence of two witnesses.

JOSEPH BERTRAND.

Witnesses:

NELLIE FEL'rsKoe, H. G. BAToHELoR; 

